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Title: Mixing of salinity-stratified water by pneumatic barriers. Report 1, Preliminary investigations : hydraulic model
Authors: McAnally, William H.
Keywords: Hydraulic models
Pneumatic barriers
Stratified flow
Saline water barriers
Issue Date: Jun-1973
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Research report (U.S. Army Engineer Waterways Experiment Station) ; H-73-4 rept.1.
Description: Research Report
Abstract: Preliminary tests were conducted at the U. S. Army Engineer Waterways Experiment Station to identify the process involved in mixing salinity-stratified bodies of water by means of a pneumatic (bubble) screen. Salinity, velocity, and photographic data from these tests serve as a basis for planning experiments that will ultimately develop scaling relations for the use of pneumatic screens as mixing devices. In a two-dimensional flume with an initially two-layer, density-stratified system, the flow pattern created by the operation of a pneumatic screen is a three-layer system. This flow was shown by flume tests using dye tracers on each side of the screen. A circulation cell is formed that draws water toward the pneumatic screen in the upper and lower layers, mixes the different-density waters in the immediate vicinity of the screen, and discharges the mixture as an intermediate-density wedge flowing away from the screen along the initial density interface. The results of these tests suggest that the pneumatic screen may be modeled by producing scaled currents in a hydraulic model by whatever means is convenient, thus avoiding problem of scaling the pneumatic screen apparatus. Also, based upon the results of these tests, a four-phase research program to develop appropriate scaling relations is recommended. This program would culminate in a prototype scale installation to permit direct evaluation of the results obtained.
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